阅读说明：本技术 一种离心泵的机封冲洗水轴承冷却水供水系统及控制方法 (Machine seal flushing water bearing cooling water supply system of centrifugal pump and control method ) 是由 李剑勇 张向波 陈建军 聂正华 罗洪兵 周江松 闵昱辉 周旻昊 于 2021-09-07 设计创作，主要内容包括：本发明公开了一种离心泵的机封冲洗水轴承冷却水供水系统及控制方法,主要针对应用复杂地形长距离大管径高扬程管道输调水中离心泵的机械密封冲洗水和泵两端轴承润滑油冷却水的供水,具体从离心泵泵体安装一个四通接头连接管路引水,其中一端安装于离心泵,出水往三个方向排放,在四通接头上口接管并安装球阀,排放泵腔内的空气,从四通接头出水口管接至两端机封供水口和泵两端轴承的冷却水槽,在泵两端轴承的冷却水槽设计连接管路,接至泵入口管路上,利用泵和轴承润滑油冷却水槽之间与泵腔和机械密封部之间的压力差形成循环冲洗及冷却系统,省去轴承冷却水供水系统的同时也省去机械密封水供水系统,降低建设成本、生产成本、检修维护成本。(The invention discloses a mechanical seal flushing water bearing cooling water supply system of a centrifugal pump and a control method, mainly aiming at supplying mechanical seal flushing water of the centrifugal pump and lubricating oil cooling water of bearings at two ends of the pump in water delivery and regulation by applying a long-distance and high-lift pipeline with complex terrain, particularly installing a four-way joint connecting pipeline for water diversion from a pump body of the centrifugal pump, wherein one end of the four-way joint connecting pipeline is installed on the centrifugal pump, outlet water is discharged in three directions, a ball valve is installed on an upper opening of the four-way joint for discharging air in a pump cavity, a cooling water tank connected to a water outlet pipe of the four-way joint to bearings at two ends of the pump and bearings at two ends of the pump is provided with a connecting pipeline connected to a pump inlet pipeline, a circulating flushing and cooling system is formed by utilizing the pressure difference between the pump and the lubricating oil cooling water tank of the bearing and between a pump cavity and a mechanical seal part, and the mechanical seal water supply system is saved, the construction cost, the production cost and the maintenance cost are reduced.)

1. The utility model provides a machine of centrifugal pump seals sparge water bearing cooling water supply system, its characterized in that, the centrifugal pump body (9) is connected with four way connection (11), and left delivery pipe (6) and left cooling water pipe (4) are connected to left bearing cooling trough (3) in proper order to the left end of four way connection (11), and the right-hand member of four way connection (11) is connected to right bearing cooling trough (20) through right connecting pipe (14) and right cooling water pipe (18).

2. The mechanical seal washing water bearing cooling water supply system of the centrifugal pump according to claim 1, characterized in that the left bearing cooling water tank (3) is connected with a left water inlet interface (27) installed on the centrifugal pump inlet pipe (25) through a left water return pipe (28); the right bearing cooling water tank (20) is connected with a right water inlet interface (23) arranged on an inlet pipe (25) of the centrifugal pump through a right water return pipe (22).

3. The mechanical seal flushing water bearing cooling water supply system of the centrifugal pump as claimed in claim 1, wherein the left water supply pipe (6) is connected with a left flushing water pipe (8), and the left flushing water pipe (8) is connected to the left mechanical seal part (31) to communicate the four-way joint (11) with the left mechanical seal part (31); the right connecting pipe (14) is connected with a right flushing water pipe (17), and the right flushing water pipe (17) is connected to the right mechanical sealing part (32) to enable the four-way joint (11) and the right mechanical sealing part (32) to be communicated.

4. A mechanical seal washing water bearing cooling water supply system of a centrifugal pump according to claim 1 or 3, characterized in that a right Y-shaped filter (13) is installed on the right connection pipe (14) and a left Y-shaped filter (10) is installed on the left water supply pipe (6).

5. The mechanical seal flushing water bearing cooling water supply system of the centrifugal pump according to claim 1 or 3, characterized in that a manual ball valve (12) is mounted on the four-way joint (11).

6. A centrifugal pump machine seal wash water bearing cooling water supply system according to claim 2, characterized in that a left observer (29) or monitoring device is mounted on the left return pipe (28), and a right observer (21) or monitoring device is mounted on the right return pipe (22).

7. The mechanical seal flushing water bearing cooling water supply system of a centrifugal pump according to claim 6, characterized in that a left cooling water pipe ball valve (5) is installed on the left cooling water pipe (4), and a right cooling water pipe ball valve (15) is installed on the right cooling water pipe (18).

8. A mechanical seal washing water bearing cooling water supply system of a centrifugal pump according to claim 3, characterized in that a left washing water pipe ball valve (7) is installed on a left washing water pipe (8), and a right washing water pipe ball valve (16) is installed on a right washing water pipe (17).

9. A control method of a machine seal flushing water bearing cooling water supply system of a centrifugal pump is characterized in that,

step 1: when the centrifugal pump is in a shutdown state, closing a left cooling water pipe ball valve (5), a left flushing water pipe ball valve (7), a right cooling water pipe ball valve (15), a right flushing water pipe ball valve (16) and a manual ball valve (12);

step 2: before the pump runs, an inlet valve of a pump set is opened, the manual ball valve (12) is slowly opened for exhausting, and the manual ball valve (12) is closed when the manual ball valve (12) discharges water;

and step 3: open left cooling water pipe ball valve (5), left side wash water pipe ball valve (7), right cooling water pipe ball valve (15), right side wash water pipe ball valve (16), until left bearing cooling trough (3), right bearing cooling trough (20), right wet return (22), left wet return (28), left mechanical seal portion (31), right mechanical seal portion (32) fill up water, open manual ball valve (12), once exhaust, close manual ball valve (12) when the air in the centrifugal pump body (9) is cleared the play water.

10. The control method of the mechanical seal flushing water bearing cooling water supply system of the centrifugal pump is characterized in that the temperature of the bearing lubricating oil at the two ends of the centrifugal pump body (9) is monitored by a left observer (29) and a right observer (21) or by temperature monitoring, and the temperature of the bearing lubricating oil at the two ends of the centrifugal pump body (9) is controlled by adjusting the water quantity of the cooling water passing through the left cooling water pipe (4) and the right cooling water pipe (18) through the left cooling water pipe ball valve (5) and the right cooling water pipe ball valve (15).

Technical Field

The invention relates to a water supply system for sealing washing water and bearing cooling water of a pump and a control method, in particular to a water supply system for bearing cooling water of mechanical sealing washing water of a centrifugal pump and a control method.

Background

At present, more and more water delivery and distribution projects are generated in China, and more centrifugal pumps are used in water delivery and distribution systems. Because the mechanical seal has the advantages of reliable seal, long service life, low friction power consumption and the like, the mechanical seal is widely applied to large and medium-sized domestic pipeline water delivery and water transfer projects, in a horizontal split horizontal single-stage or multi-stage centrifugal pump used, the common water sealing of the centrifugal pump is basically provided by designing and installing a whole set of complex water supply system, and the invested capital and labor cost in the operation and maintenance process is high. The centrifugal pump shaft and the bearing work in a high-temperature, high-pressure and high-speed environment, the temperature rise of the shaft and the bearing is greatly higher than the allowable working temperature rise range due to the friction heat generated by the high-speed rotation of the bearing, the lubricating oil is coked due to the high temperature, and the sealing ring loses elasticity due to carbon deposition and other adverse effects. It is highly desirable to cool the shaft and bearing assembly with good cooling. In a common horizontal split horizontal single-stage or multi-stage centrifugal pump, a set of complex water supply system is basically designed and installed to supply bearing cooling water for common centrifugal pump machine sealing. The construction cost, the production cost and the overhaul and maintenance cost of the project are increased invisibly, and the integral operation control is not convenient.

Disclosure of Invention

The invention aims to: aiming at the existing problems, the mechanical seal flushing water bearing cooling water supply system of the centrifugal pump and the control method thereof are provided, a set of mechanical seal flushing water and bearing lubricating oil cooling water supply system is optimized and omitted, and the cooling water of the bearings at two ends of the centrifugal pump can be supplied while the supply of mechanical seal water is stably provided. By utilizing the pressure difference between the pump cavity, the bearing lubricating oil cooling water tank and the centrifugal pump inlet pipe formed in the operation of the pump body and the high pressure area in the pump cavity of the centrifugal pump body (9) in the operation of the pump, the circulating working mode of a bearing lubricating oil cooling system and a mechanical seal flushing water system is formed, and the temperature stable control of the bearing lubricating oil and the stable water supply continuous work of the mechanical seal flushing water are improved. A set of bearing cooling water supply system is omitted, and a set of mechanical seal water supply system is omitted, so that the construction cost, the production cost and the overhaul and maintenance cost are reduced.

The technical scheme adopted by the invention is as follows:

the invention aims to: aiming at the existing problems, the mechanical seal flushing water bearing cooling water supply system of the centrifugal pump and the control method thereof are provided, the mechanical seal water and bearing lubricating oil cooling water supply system is optimized and omitted, and the cooling water of the bearing lubricating oil at two ends of the centrifugal pump can be provided while the mechanical seal flushing water is stably supplied.

The technical scheme adopted by the invention is as follows:

the invention provides a machine seal washing water bearing cooling water supply system of a centrifugal pump, wherein a pump body of the centrifugal pump is connected with a four-way joint, the left end of the four-way joint is sequentially connected with a left water supply pipe and a left cooling water pipe to be connected to a left bearing cooling water tank, and the right end of the four-way joint is connected to a right bearing cooling water tank through a right connecting pipe and a right cooling water pipe. The water pressure of the pump cavity in the operation of the pump is higher than the water pressure of the left bearing cooling water tank and the right bearing cooling water tank, so that an automatic water supply system is formed, bearing lubricating oil can be circulated and effectively cooled, the service life of the bearing is prolonged, one set of independent bearing cooling water supply system is omitted, and the construction cost, the production cost and the maintenance cost are reduced.

Furthermore, the left bearing cooling water tank is connected with a left water inlet interface arranged on the inlet pipe of the centrifugal pump through a left water return pipe; the right bearing cooling water tank is connected with a right water inlet interface arranged on the inlet pipe of the centrifugal pump through a right water return pipe. Utilize pump operation in left bearing cooling trough water pressure and right bearing cooling trough water pressure be higher than centrifugal pump inlet pipe water pressure, form automatic cooling circulation system, utilize simple structural change to make centrifugal pump cooling water form with from the cooling structure that circulates, when effectively utilizing the water resource, improved the circulative cooling effect, ensure centrifugal pump safety and stability high-efficient operation. Furthermore, the left water supply pipe is connected with a left flushing water pipe which is connected to the left mechanical sealing part, so that the four-way joint is communicated with the left mechanical sealing part; the right connecting pipeline is connected with a right flushing water pipe, and the right flushing water pipe is connected to the right mechanical sealing part to enable the four-way joint to be communicated with the right mechanical sealing part. The inner liquid of the mechanical seal formed by the flushing water pipe, the water supply pipe and the mechanical seal part is flushed due to pressure difference to form a circulating system, so that the circulating flushing effect is improved, and the mechanical seal can continuously work without leakage. A set of independent mechanical sealing water supply system is omitted, and the construction cost, the production cost and the maintenance cost are reduced.

Furthermore, a left Y-shaped filter is arranged on the right connecting pipeline, and a right Y-shaped filter is arranged on the left water supply pipe. The water filter has the advantages that water supplied to the mechanical sealing part and the bearing cooling water tank can be effectively filtered, particles in the water are removed, and the stability of the structure and the service life are ensured.

Furthermore, a ball valve is arranged on the four-way joint. Can be with air in the pump through the ball valve discharge before the pump starts, avoid the vacuum pump idle running, cause equipment to damage.

Furthermore, a left observer or a monitoring device is installed on the left water return pipe, and an observer or a monitoring device is installed on the right water return pipe. Can in time monitor the rivers condition in the wet return and in time discover the problem through observer and monitoring devices.

Furthermore, a left cooling water pipe ball valve is arranged on the left cooling water pipe, and a right cooling water pipe ball valve is arranged on the right cooling water pipe. The temperature of the bearing lubricating oil can be effectively controlled by adjusting the left cooling water pipe ball valve and the right cooling water pipe ball valve to adjust the water volume of the cooling water passing through the left cooling water pipe and the right cooling water pipe.

Furthermore, a left flushing water pipe ball valve is arranged on the left flushing water pipe, and a right flushing water pipe ball valve is arranged on the right flushing water pipe. When the equipment has emergency and stops running, the left flushing water pipe ball valve and the left cooling water pipe ball valve are matched with each other to close the left system water supply, and the right manual ball valve and the right cooling water pipe ball valve are matched with each other to close the right system water supply.

The invention provides a method for using a mechanical seal flushing water bearing cooling water supply system of a centrifugal pump,

the method comprises the following steps: when the centrifugal pump is in a shutdown state, closing the left cooling water pipe ball valve, the left flushing water pipe ball valve, the right cooling water pipe ball valve, the right flushing water pipe ball valve and the manual ball valve;

step two: opening an inlet valve of a pump set, slowly opening a manual ball valve to exhaust, and closing the manual ball valve when the manual ball valve discharges water;

step three: and opening the left cooling water pipe ball valve, the left flushing water pipe ball valve, the right cooling water pipe ball valve and the right flushing water pipe ball valve until the left cooling water tank, the right water return pipe, the left mechanical sealing part and the left mechanical sealing part are filled with water.

Furthermore, the temperature of the lubricating oil of the bearings at the two ends of the pump is monitored in a mode of observing or monitoring the temperature through a left observer and an observer, and the water volume of the cooling water passing through the left cooling water pipe and the right cooling water pipe is adjusted through the left cooling water pipe ball valve and the right cooling water pipe ball valve, so that the temperature of the lubricating oil of the bearings at the two ends of the pump is controlled. Ensure safe, stable and efficient operation of equipment

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the process is effectively optimized, a set of independent mechanical seal water supply system is omitted, liquid flows to low pressure due to pressure difference and high pressure during pump operation to form a circulating system, the circulating flushing effect is improved, the mechanical seal can continuously work without leakage, a mechanical seal water supply mode of the centrifugal pump is provided, the construction and operation and maintenance cost is reduced, and the human resources are saved.

2. The process is further effectively optimized, a set of independent bearing lubricating oil cooling water supply system is omitted, the centrifugal pump cooling water is formed into a self-circulation cooling structure by using simple structural changes, the water resource is effectively utilized, the circulation cooling effect is improved, the water supply stability of the bearing lubricating oil cooling water is improved, the operation control is convenient, the construction and operation and maintenance cost is further reduced, and the resources are saved.

3. The science and technology passes through temperature monitoring, adjusts according to the height of temperature, and the temperature of the both ends bearing lubricating oil of the size pump of supplying water is in the scope, has ensured the safe and stable high-efficient operation of system.

4. Effectively ensure the safe, stable and efficient operation of the centrifugal pump and improve the conveying capacity of the water conveying and transferring system.

Drawings

FIG. 1 is a schematic view of a pump seal flush water and bearing cooling water supply system.

The labels in the figure are: 1 is a coupling, 2 is a drive end bearing, 3 is a left cooling water tank, 4 is a left cooling water pipe, 5 is a manual ball valve, 6 is a left water supply pipe, 7 is a left flushing water pipe ball valve, 8 is a left flushing water pipe, 9 is a centrifugal pump body, 10 is a left Y-shaped filter, 11 is a four-way joint, 12 is a manual ball valve, 13 is a right Y-shaped filter, 14 is a right water supply pipe, 15 is a manual ball valve, 16 is a right flushing water pipe ball valve, 17 is a right flushing water pipe, 18 is a right cooling water pipe, 19 is a right drive end bearing, 20 is a right bearing cooling water tank, 21 is a right observer, 22 is a right water return pipe, 23 is a right water inlet interface, 24 is an inlet pipe, 25 is an inlet pipe, 26 is a base, 27 is a left water inlet interface, 28 is a left water return pipe, 29 is a left observer, 30 is a main shaft, 31 is a left mechanical seal, and 32 is a right mechanical seal.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in figure 1, the mechanical seal is positioned at two ends of the centrifugal pump, the mechanical seal end covers are positioned on the pump cover of the centrifugal pump and the pump body 9 of the centrifugal pump, the connecting short pipe is installed from the top of the pump body 9 of the centrifugal pump, the other end of the short pipe is provided with a four-way joint 11, the other end of the four-way joint 11 is provided with a manual ball valve 12, and water flows to the left and right water supply directions through the four-way joint 11. The left end of the four-way joint 11 is sequentially connected with a left water supply pipe 6, a T-shaped joint and a left cooling water pipe 4 to enable the four-way joint 11 to be communicated with a left bearing cooling water tank 3, meanwhile, a left Y-shaped filter 10 is installed on a path of the left water supply pipe 6, left mechanical sealing water and bearing lubricating oil cooling water are supplied through the left water supply pipe 6, the other end of the T-shaped joint is connected with a left flushing water pipe 8, the left flushing water pipe 8 is connected to a left mechanical sealing part 31, and the four-way joint 11 is communicated with the left mechanical sealing part 31. The left bearing cooling water tank 3 is connected with a left water inlet interface 27 arranged on the centrifugal pump inlet pipe 25 through a left water return pipe 28, a left observer 29 or a monitoring device is arranged on the left water return pipe 28, a left cooling water pipe ball valve 5 is arranged on the left cooling water pipe 4, and a left flushing water pipe ball valve 7 is arranged on the left flushing water pipe 8.

When the centrifugal pump body 9 starts to operate, water flows in from the inlet pipe of the inlet pipe 25 of the centrifugal pump at the low-pressure end, and flows out from the outlet of the pump after pressurization, at the moment, the water pressure in the pump cavity of the centrifugal pump body 9 belongs to a high-pressure area, the water pressure of the pump cavity is higher than the water pressure of the left bearing cooling water tank 3, and the water pressure of the left bearing cooling water tank 3 is higher than the water pressure of the inlet pipe 25 of the centrifugal pump. Therefore, water enters the left bearing cooling water tank 3 through the four-way joint 11, the left water supply pipe 6, the left Y-shaped filter 10, the left cooling water pipe ball valve 5 and the left cooling water pipe 4, then enters the left water inlet interface 27 through the left water return pipe 28, finally flows in from the pump 9 again, and forms left side circulating water supply. An automatic water supply system is formed by utilizing the water pressure difference among all parts formed in the operation of the pump, and the bearing lubricating oil can be effectively cooled in a circulating way.

The right end of the four-way joint 11 is connected with a right connecting pipe (14), a T-shaped joint and a right cooling water pipe 18 in sequence to enable the four-way joint 11 to be communicated with a right bearing cooling water tank 20, a right Y-shaped filter 13 is installed on the way of the right connecting pipe (14), mechanical sealing water and bearing lubricating oil cooling water on the right side are supplied through the right connecting pipe (14), the other end of the T-shaped joint is connected with a right flushing water pipe 17, the right flushing water pipe 17 is connected to a right mechanical sealing part 32, and the four-way joint 11 is communicated with the right mechanical sealing part 32. The right bearing cooling water tank 20 is connected with a right water inlet interface 23 arranged on a centrifugal pump inlet pipe 25 through a right water return pipe 22, a right observer 21 or a monitoring device is arranged on the right water return pipe 22, a right cooling water pipe ball valve 15 is arranged on the right cooling water pipe 18, and a right flushing water pipe ball valve 16 is arranged on the right flushing water pipe 17.

When the centrifugal pump body 9 is started to operate, the water pressure in the pump cavity of the centrifugal pump body 9 belongs to a high pressure area at the moment, the water pressure of the pump cavity is higher than the water pressure of the right bearing cooling water tank 20, and the water pressure of the right bearing cooling water tank 20 is higher than the water pressure of the centrifugal pump inlet pipe 25. Therefore, water enters the right bearing cooling water tank through the four-way joint 11, the right connecting pipe (14), the right Y-shaped filter 13, the right cooling water pipe ball valve 15 and the right cooling water pipe 18, then enters the right water inlet interface 23 after passing through the right water return pipe 22, and finally flows in from the 25 inlet pipe of the 9 pump again, so that right circulating water supply is formed. An automatic water supply system is formed by utilizing the water pressure difference among all parts formed in the operation of the pump, and the bearing lubricating oil can be effectively cooled in a circulating way.

The method and the principle of the invention for using the mechanical seal flushing water bearing cooling water supply system of the centrifugal pump are as follows:

step 1: when the centrifugal pump is in a shutdown state, the left cooling water pipe ball valve 5, the left flushing water pipe ball valve 7, the right cooling water pipe ball valve 15, the right flushing water pipe ball valve 16 and the manual ball valve 12 are closed.

Step 2: and opening an inlet valve of the pump set, slowly opening the manual ball valve 12 for exhausting, and closing the manual ball valve 12 when the manual ball valve 12 discharges water.

And step 3: open left cooling water pipe ball valve 5, left side wash water pipe ball valve 7, right cooling water pipe ball valve 15, right side wash water pipe ball valve 16, fill up water until left bearing cooling trough 3, right bearing cooling trough 20, right wet return 22, left wet return 28, left mechanical seal portion 31, right mechanical seal portion 32, reopen manual ball valve (12), exhaust once more, close manual ball valve (12) when the air clean-out in the centrifugal pump body 9 goes out water, the air in the pump chamber has all been cleaned this moment, possess the pump-starting condition.

And 4, step 4: the temperature of the bearing lubricating oil at the two ends of the centrifugal pump body 9 is monitored by the left observer 29 and the right observer 21 or by the temperature monitoring mode, the water quantity of the cooling water passing through the left cooling water pipe 4 and the right cooling water pipe 18 is adjusted by the left cooling water pipe ball valve 5 and the right cooling water pipe ball valve 15, and the temperature of the bearing lubricating oil at the two ends of the centrifugal pump body 9 is controlled. The safe, stable and efficient operation of the equipment is ensured.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.